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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cf5af2b7b34aa4c72710157af23654a6ca5e6b5591e4d6ded426e9d58ce1374' 
  AND token = 'SXiTRpomm/1MO7nZBgHpzkSdPds18foifUY/odPbUJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}